Ine's Muscle Experiment 7

Thinking for a moment the process was done, Ine suddenly felt a tightening near his lower back… and he couldn’t help cracking a grin as he bent forward to allow his tail room to grow… and grow it did! Within a few seconds, an absolutely massive, muscular tail burst free. Ine was thrilled!

Part 7 of a muscle growth sequence commission for lycanlover777